Vehicular rearview mirror system with microcontroller

ABSTRACT

A vehicular rearview mirror system includes an interior rearview mirror system having an electrochromic reflective element, a digital electrochromic drive circuit supplying a drive signal to the reflective element and a garage door opener. The garage door opener includes a transmitter and logic circuit. The logic circuit supplies signals to the transmitter for transmitting garage door opening signals. A microcontroller is provided which defines, at least in part, the digital drive circuit and logic circuit. In this manner, the digital electrochromic mirror system and the garage door opener have at least some components in common. The microcontroller communicates over a vehicle network with at least one module performing at least one other vehicle function. The vehicle network may have at least wired interconnections and may further have wireless interconnections.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of prior U.S. patent application Ser. No. 10/134,716, filed on Apr. 29, 2002, now U.S. Pat. No. 6,639,519, which is a continuation of U.S. patent application Ser. No. 09/820,013, filed on Mar. 28, 2001, now U.S. Pat. No. 6,396,408, which claims priority from U.S. provisional patent application Ser. No. 60/196,577, filed on Mar. 31, 2000, the disclosures of which are hereby incorporated herein by reference in their entireties.

BACKGROUND OF THE INVENTION

This invention relates generally to vehicle rearview mirror systems and, more particularly, to digital electrochromic rearview mirror systems.

Digital electrochromic mirror systems are described in commonly assigned U.S. Pat. No. 6,089,721 entitled DIGITAL ELECTROCHROMIC MIRROR SYSTEM and U.S. Pat. No. 6,056,410 entitled DIGITAL ELECTROCHROMIC MIRROR SYSTEM, the disclosures of which are hereby incorporated herein by reference. Such systems are capable of controlling the reflectance level of an electrochromic element from the output of a microcomputer.

Various forms of vehicle communication systems have been developed including wired networks, or busses, operating one of several known protocols. These include a LIN (Local Interconnect Network), a LAN (Local Area Network), a CAN (Car or Controlled Area Network), and the like. An advantage of such vehicle networks is that the wire harness to the mirror can be minimized to as few as three wires or so, yet provide a variety of functions. Wireless communication networks utilizing radio frequency and/or infrared communication for vehicles have also been proposed, such as those utilizing the BLUETOOTH protocol. Such wireless communication and the BLUETOOTH protocol are described in more detail in commonly assigned U.S. patent application Ser. No. 09/793,002, filed Feb. 26, 2001, entitled VIDEO MIRROR SYSTEMS INCORPORATING AN ACCESSORY MODULE, now U.S. Pat. No. 6,690,268, the disclosure of which is hereby incorporated herein by reference.

Trainable garage door openers, such as a universal garage door opener available from Johnson Controls/Prince Corporation, Holland, Michigan under the trade name HOMELINK™, include a transmitter for a universal home access system, which replaces the switch in a household garage door opener that opens/closes the garage door. A garage door opener communicating with a smart switch that is programmable to a household specific code that is of the rolling code type, such as is available from TRW Automotive, Farmington Hills, Mich. under the trade name KWIKLINK™, is known to be mounted within vehicles. As described in commonly assigned U.S. Pat. No. 6,172,613 B1, the disclosure of which is hereby incorporated herein by reference, the universal garage door opener HOMELINK™ unit or the universal home access KWIKLINK™ unit may be mounted at, within, or on an interior rearview mirror assembly. The KWIKLINK™ system is a low-current device that can, optionally, be operated off of a battery source, such as a long-life lithium battery. It is also compact and lightweight as executed on a single- or double-sided printed circuit board.

SUMMARY OF THE INVENTION

The present invention provides a new and unique combination of a digital electrochromic mirror system, a vehicle accessory and a vehicle network, and, more particularly, a combination of a digital electrochromic mirror system, a garage door opener and a vehicle network. According to an aspect of the invention, a vehicular rearview mirror system includes a digital electrochromic mirror system having a digital drive circuit and an electrochromic reflective element. The reflective element assumes a partial reflectance level in response to a drive signal. The drive circuit provides a drive signal to the reflectance element. The mirror system further includes a garage door opener including a transmitter and a logic circuit. The logic circuit supplies signals to the transmitter for transmitting garage door opening signals. The mirror system further includes a microcontroller which defines, at least in part, the digital drive circuit and the logic circuit. In this manner, the digital electrochromic mirror system has components in common with the garage door opener. According to this aspect of the invention, the microcontroller communicates over a vehicle network with at least a module performing at least one other vehicle function. The vehicle network may have at least wired network connections and may further have wireless connections. The vehicle network may have a protocol selected from the group consisting of a LIN, a CAN, or a LAN.

According to this aspect of the invention, the digital drive circuit and the logic circuit may be mounted on a common circuit board. Power to the digital drive circuit and logic circuit may be supplied from a battery, preferably a rechargeable battery, that is separate from the vehicle ignition. The battery may be charged from a solar power system.

According to another aspect of the invention, a vehicle rearview mirror system includes an interior rearview mirror system made up of an electrochromic reflective element, a housing for the electrochromic reflective element and a circuit board in the housing. The electrochromic reflective element assumes a partial reflectance level in response to a drive signal. A digital electrochromic drive circuit is provided on the circuit board and supplies a drive signal to the reflective element. The mirror system further includes a garage door opener. The garage door opener includes a transmitter and a logic circuit, at least one of which (and preferably, both) is on the circuit board, and share components with, the electrochromic drive circuit. The logic circuit supplies signals to the transmitter for transmitting garage door opening signals. The garage door opener may, optionally and preferably, also serve as a receiver or a transceiver for a tire pressure status monitoring/display system, such as disclosed in commonly assigned U.S. patent application Ser. No. 09/513,941, filed Feb. 28, 2000, entitled TIRE INFLATION ASSISTANCE MONITORING SYSTEM, now U.S. Pat. No. 6,294,989, and U.S. patent application Ser. No. 09/710,016, filed Nov. 10, 2000, entitled TIRE INFLATION ASSISTANCE MONITORING SYSTEM, now U.S. Pat. No. 6,445,287, the disclosures of which are hereby incorporated herein by reference, and thus have a dual tire pressure monitoring/display and garage door opener function. The minor system further includes a microcontroller which defines, at least in part, the digital drive circuit and the logic circuit. The digital electrochromic mirror system has components in common with the garage door opener. The microcontroller communicates over a vehicle network with at least one module performing at least one other vehicle function.

These and other objects, advantages and features of this invention will become apparent upon review of the following specification in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top plan view of a vehicle having a vehicular rearview mirror system, according to the invention;

FIG. 2 is an electronic block diagram of a digital electrochromic mirror system, according to the invention; and

FIG. 3 is an electronic block diagram of a vehicular rearview mirror system, according to the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now specifically to the drawings, and the illustrative embodiments depicted therein, a vehicular rearview mirror system 10 is illustrated with a vehicle 11 and includes an interior rearview mirror assembly 16 and one or more exterior rearview mirror assemblies, such as driver side exterior rearview mirror assembly 12 and/or passenger side exterior rearview mirror assembly 14 (FIG. 1). Interior rearview mirror assembly 16 includes a digital electrochromic mirror system 18 which is preferably supplied according to the principles disclosed in commonly assigned U.S. Pat. Nos. 6,089,721 and 6,056,410, the disclosures of which are hereby incorporated herein by reference. Although the particulars of the invention are illustrated with an interior rearview mirror assembly 16, it should be understood that the principles of the invention could be equally applied to either or both exterior rearview mirror assemblies 12, 14.

Digital electrochromic mirror system 18 includes a microcontroller 20 and an electrochromic mirror reflective element 22. As is disclosed in the '721 and '410 patents, microcontroller 20 receives inputs from light sensors 24 (preferably phototransistors or photodiodes) and supplies digital outputs 26 a, 26 b which control solid-state switches 28 a, 28 b in order to provide a drive signal at 30 thereby establishing a partial reflectance level of electrochromic reflective element 22. Microcontroller 20 includes a microprocessor.

Digital electrochromic mirror system 18 further includes a bus interface 32 which interfaces with a vehicle network, or bus, 34. Items on network 34 can be connected by wired or wireless connection. Wired connection may include wire, cables, fiber-optic cables, and the like. Wireless connection can be by infrared (IR) or radio-frequency (RF) communication, and, preferably, may be a short-range RF interconnection using the BLUETOOTH protocol. Vehicle network, or bus, 34 may utilize various buss protocols including a Local Internet Network (LIN), a Local Area Network (LAN), a Car (a/k/a Controlled) Area Network (CAN), or other vehicle network protocol. The BLUETOOTH protocol is a low-cost, low-power radio-based cable replacement or wireless link based on short-range radio-based technology. BLUETOOTH enables creation of a short-range (typically 30 feet or so, although longer and shorter ranges are possible), wireless personal area network via small radio transmitters built into various devices. For example, transmission can be on a 2.45 gigahertz band, moving data at about 721 kilobits per second, or faster. In the illustrated embodiment, network 34 is a multi-drop bus which requires three or fewer wires for communication between a plurality of other vehicle functions 36, as illustrated in FIG. 3. In situations where timing and power consumption system constraints may cause network 34 wakeup time to be too slow for an automobile maker system response requirement, suitable adjustments may be made in the architecture of network 34. The network may be configured as disclosed in commonly assigned U.S. patent application Ser. No. 09/341,450 filed Jul. 8, 1999, by Drummond et al. for a VEHICLE REARVIEW MIRROR AND A VEHICLE CONTROL SYSTEM INCORPORATING SUCH MIRROR, now U.S. Pat. No. 6,291,905, the disclosure of which is hereby incorporated herein by reference.

Other vehicle functions 36 include, by way of example, a seatbelt warning status 38, which status may be displayed on a mirror-based display 40. Preferably, minor-based display 40 may be located on, at or adjacent interior rearview mirror assembly 16. Mirror-based display 40 may be of various forms including that disclosed in commonly assigned U.S. patent application Ser. No. 09/799,414, filed on Mar. 5, 2001, by McCarthy et al., entitled COMPLETE MIRROR-BASED GLOBAL-POSITIONING SYSTEM (GPS) NAVIGATION SOLUTION, now U.S. Pat. No. 6,477,464, the disclosure of which is hereby incorporated herein by reference. Additionally, display 40 may display magnetic vehicle heading information from a magnetic sensor 42, the information being supplied over network 34. Additionally, reverse gear status from a reverse gear sensor 44 maybe supplied over network 34 to cause digital electrochromic mirror 18 to assume a high reflectance level when vehicle 11 is placed in reverse gear. Rearview minor system 10 may additionally receive engine information 46 and/or door opener information at 48 over network 34 and activate general lighting 50 located in, at or on interior rearview mirror assembly 16, such as when a door of vehicle 11 is opened. Status from all alarm assembly 52 may also be conveyed over network 34 and displayed by display 40.

Dim ratios, or partial reflectance levels developed from light sensors 24, can be transmitted over network 34 for use to drive exterior mirrors 12, 14. Optionally, a dim ratio or partial reflectance level chosen for a driver-side exterior mirror may be different from (and typically greater than) a dim ratio or partial reflectance level chosen for a passenger-side exterior mirror, and both may be different from a dim ratio or partial reflectance level chosen for a interior electrochromic mirror. Ambient light information, sensed by an ambient light sensor 57, can also be transmitted over network 34 for use in dimming of instrument panel 54 or automatic headlight functions 56. Alternatively, ambient light information can be developed by interior rearview mirror assembly 16 as disclosed in commonly assigned U.S. Pat. No. 5,715,093, the disclosure of which is hereby incorporated herein by reference.

The interior rearview mirror assembly includes microcontroller 20 and a printed circuit board 61, that are common to both the digital electrochromic minor system 18 and garage door opener function 66. Sharing of components and circuit board space can facilitate a reduction of susceptibility to RF/EMI interference and reduce cost and avoid duplication of both the network interface hardware 32, communication software and some processing power. The interior rearview mirror assembly may also include a video display system, such as disclosed in commonly assigned U.S. patent application Ser. No. 09/793,002, filed Feb. 26, 2001, entitled VIDEO MIRROR SYSTEM INCORPORATING AN ACCESSORY MODULE, now U.S. Pat. No. 6,690,268, the disclosure of which is hereby incorporated herein by reference. Components may be shared between the video display system, the digital electrochromic mirror system and/or the garage door opener. Additionally, microcontroller 20 may control a forward-facing camera system and headlight control which may also share components with the digital electrochromic mirror system and/or the garage door opener. Such forward-facing camera system and headlight control may be of the type disclosed in commonly assigned U.S. Pat. 5,796,094 entitled VEHICLE HEADLIGHT CONTROL USING IMAGING SENSOR, the disclosure of which is hereby incorporated herein by reference. An imaging sensor based rain sensor of the type disclosed in commonly assigned U.S. patent application Ser. No. 09/530,306, filed Apr. 27, 2000, entitled RAIN SENSOR WITH FOG DISCRIMINATION, now U.S. Pat. No. 6,353,392, may also be incorporated in circuit board 61 and share components with the digital electrochromic mirror system and/or the garage door opener.

With microcomputer 20 driving digital electrochromic mirror system 18, and with vehicle status information available over network 34, it is possible to have a circuit assembly 61 in or at interior rearview mirror assembly 16 that is powered by a battery 62 that is separate from the vehicle ignition storage battery. As an example, battery 62 may be of a long-life lithium type battery. Moreover, because of its relatively small size, battery 62 may be recharged by a separate dedicated solar-powered rechargeable battery source 64 of the type described in commonly assigned patent application Ser. No. 09/793,002, filed Feb. 26, 2001, entitled VIDEO MIRROR SYSTEMS INCORPORATING AN ACCESSORY MODULE, now U.S. Pat. No. 6,690,268, the disclosure of which is hereby incorporated herein by reference. By powering mirror system 10 by a separate-dedicated solar-powered rechargeable battery source, minor system 10 can consume power from its dedicated/local battery source, and any power used up during nighttime hours can be replenished by day via solar cell/panel that is a part of battery charger 64 and is connected to the dedicated battery 62 so as to recharge/charge during daytime hours. Furthermore, microcomputer 20 can be put into various power-saving modes thereby enabling electronic assembly 61 to be used for control of a garage door opener 66, such as a HOMELINK™ unit or the universal home access KWIKLINK™ unit.

Also, a mirror-mounted microphone/digital sound-processing system 68, as disclosed in commonly assigned patent application Ser. No, 09/466,010, filed by DeLine et al., on Dec. 17, 1999, for an INTERIOR REARVIEW MIRROR SOUND-PROCESSING SYSTEM, now U.S. Pat. No. 6,420,975, the disclosure of which is hereby incorporated herein by reference, may be also powered by battery 62. Preferably, sound-processing system 68 is incorporated in circuit assembly 61 and, most preferably, shows microcontroller 20 with garage door opener 66 and digital electrochromic mirror 18. Communication button press information 58 can be transmitted over network 34 for various uses by other electronic control units, such as activation of a rescue system 60, such as General Motors' ONSTAR™ system, a Ford Motor Company's RESCU™ system, or the like. Use of digital signal-processing and a single mirror-mounted microphone (such as is described in U.S. patent application Ser. No. 09/396,179, filed Sep. 14, 1999, entitled INDICATOR FOR VEHICLE ACCESSORY, now U.S. Pat. No. 6,278,377, the disclosure of which is incorporated by reference herein) is particularly advantageous for economical achievement of clear and error-free transmission from the vehicle, while operating along a highway, to a remote receiver, particularly in speech-recognition mode. This use of network 34 facilitates location of button 58 in interior mirror assembly 16.

Microcomputer 20 may receive memory information 70 over network 34 and actuate an actuator 72 to position reflective element 24. Principles, disclosed in commonly assigned U.S. Pat. No. 5,796,176 entitled MEMORY MIRROR SYSTEM FOR VEHICLES, the disclosure of which is hereby incorporated herein by reference, may be utilized for communicating such memory information over network 34.

Microcomputer 20 may also use network 34 to measure values of light sensed by light sensors 24, supply drive signals to the electrochromic reflective element, and the like, on the network 34. Partial reflectance levels may be communicated to exterior rearview mirror assemblies 12, 24 over network 34. In this manner, if the interior digital electrochromic mirror system 18 develops a fault, incorrect information will not be transmitted to exterior rearview mirror systems. This also allows exterior reflective elements to have different peak voltages and provides more precise control over each of the mirror assemblies 12, 14, 16.

Other functions may be controlled over network 34 such as remote keyless entry 74 and global positioning system information/navigational system as described in commonly assigned co-pending application Ser. No. 09/799,414, Filed on Mar. 5, 2001, by McCarthy et al., entitled COMPLETE MIRROR-BASED GLOBAL-POSITIONING SYSTEM (GPS) NAVIGATION SOLUTION, now U.S. Pat. No. 6,477,464, the disclosure of which is hereby incorporated herein by reference.

In addition to placement at, on or in exterior rearview mirror assembly 18, circuit board 61 may be positioned at a location (and preferably in a housing) separate from interior mirror assemblies, such as disclosed in commonly assigned U.S. Pat. No. 6,099,131 entitled ELECTRO-OPTIC MIRROR SYSTEM, the disclosure of which is hereby incorporated herein by reference.

Also, the concepts of the present invention provides a new and unique combination of a digital electrochromic mirror system, a vehicle accessory and a vehicle network when the vehicle accessory comprises a tire pressure monitoring/display system.

Changes and modifications in the specifically described embodiments can be carried out without departing from the principles of the invention which is intended to be limited only by the scope of the appended claims, as interpreted according to the principles of patent law including the doctrine of equivalents. 

1. A vehicular rearview mirror system suitable for use in a vehicle, comprising: an interior rearview mirror system comprising an interior variable reflective element, said interior variable reflective element assuming a partial reflectance level in response to an interior drive signal; a microcontroller; a drive circuit, said drive circuit supplying an interior drive signal to said interior variable reflective element; a garage door opener, said garage door opener including a transmitter for transmitting a garage door opening signal; a tire pressure monitoring system, said tire pressure monitoring system including a receiver for receiving a signal indicative of vehicle tire pressure; wherein said microcontroller controls at least in part said drive circuit, said garage door opener and said tire pressure monitoring system.
 2. The vehicular rearview mirror system of claim 1 wherein said interior variable reflective element comprises an electrochromic reflective element.
 3. The vehicular rearview mirror system of claim 1 further including a digital sound-processing system, wherein said microcontroller controls at least in part said digital sound-processing system.
 4. The vehicle rearview mirror system of claim 1 including a battery supplying power to said drive circuit, said garage door opener and said tire pressure monitoring system that is separate from the vehicle ignition.
 5. The vehicle rearview mirror system of claim 4 wherein said battery is rechargeable.
 6. The vehicle rearview mirror system of claim 5 including a solar system for charging said battery.
 7. The vehicle rearview mirror system of claim 1 further comprising a driver-side exterior mirror assembly and a passenger-side exterior mirror assembly, said driver-side exterior mirror assembly comprising a driver-side variable reflective element, said driver-side variable reflectance element assuming a partial reflectance level in response to a driver-side drive signal, said passenger-side exterior mirror assembly comprising a passenger-side variable reflective element, said passenger-side variable reflectance element assuming a partial reflectance level in response to a passenger-side drive signal.
 8. The vehicle rearview mirror system of claim 7 wherein said drive circuit establishes a driver-side drive signal and a passenger-side drive signal.
 9. The vehicle rearview mirror system of claim 1 wherein said microcontroller receives an input from a phototransistor.
 10. The vehicle rearview mirror system of claim 1 wherein said microcontroller receives an input from a photodiode.
 11. The vehicle rearview mirror system of claim 1 wherein said microcontroller comprises a microprocessor.
 12. The vehicle rearview mirror system of claim 1 wherein said interior mirror system including a forward-facing camera, said forward-facing camera at least partially controlled by said microcontroller.
 13. The vehicle rearview mirror system of claim 12 wherein said forward-facing camera comprises at least one of a headlamp-controlling camera and a rain-sensing camera.
 14. The vehicle rearview mirror system of claim 1 wherein said drive circuit has components in common with said garage door opener and said tire pressure monitoring system.
 15. The vehicle rearview mirror system of claim 1 wherein said microcontroller is on a circuit board.
 16. The vehicle rearview mirror system of claim 15 wherein said drive circuit, said garage door opener and said tire pressure monitoring system are at least partially on said circuit board.
 17. A vehicular rearview mirror system suitable for use in a vehicle, comprising: at least one tire pressure sensor associated with a tire on a wheel of the vehicle, said at least one tire pressure sensor emitting a tire pressure-monitoring signal indicative of tire pressure; an interior rearview mirror system comprising an interior variable reflective element, said interior variable reflective element assuming a partial reflectance level in response to an interior drive signal; a microcontroller; a drive circuit, said drive circuit supplying an interior drive signal to said interior variable reflective element; a garage door opener, said garage door opener including a transmitter for transmitting a garage door opening signal; a tire pressure monitoring system, said tire pressure monitoring system including a receiver for receiving a signal emitted by said at least one tire pressure sensor; wherein said microcontroller controls at least in part said drive circuit, said garage door opener and said tire pressure monitoring system.
 18. The vehicular rearview mirror system of claim 17 wherein said at least one tire pressure sensor comprises a plurality of tire pressure sensors associated with different tires on different wheels of the vehicle, said tire pressure sensors emitting tire pressure-monitoring signals indicative of tire pressure of the respective ones of said tires.
 19. The vehicular rearview mirror system of claim 17 wherein said interior variable reflective element comprises an electrochromic reflective element.
 20. The vehicular rearview mirror system of claim 17 further including a digital sound-processing system, wherein said microcontroller controls at least in part said digital sound-processing system.
 21. The vehicle rearview mirror system of claim 17 including a battery supplying power to said drive circuit, said garage door opener and said tire pressure monitoring system that is separate from the vehicle ignition.
 22. The vehicle rearview mirror system of claim 21 wherein said battery is rechargeable.
 23. The vehicle rearview mirror system of claim 22 including a solar system for charging said battery.
 24. The vehicle rearview mirror system of claim 17 further comprising a driver-side exterior mirror assembly and a passenger-side exterior mirror assembly, said driver-side exterior mirror assembly comprising a driver-side variable reflective element, said driver-side variable reflectance element assuming a partial reflectance level in response to a driver-side drive signal, said passenger-side exterior mirror assembly comprising a passenger-side variable reflective element, said passenger-side variable reflectance element assuming a partial reflectance level in response to a passenger-side drive signal.
 25. The vehicle rearview mirror system of claim 24 wherein said drive circuit establishes a driver-side drive signal and a passenger-side drive signal.
 26. The vehicle rearview mirror system of claim 17 wherein said microcontroller receives an input from a phototransistor.
 27. The vehicle rearview mirror system of claim 17 wherein said microcontroller receives an input from a photodiode.
 28. The vehicle rearview mirror system of claim 17 wherein said microcontroller comprises a microprocessor.
 29. The vehicle rearview mirror system of claim 17 wherein said interior mirror system including a forward-facing camera, said forward-facing camera at least partially controlled by said microcontroller.
 30. The vehicle rearview mirror system of claim 29 wherein said forward-facing camera comprises at least one of a headlamp-controlling camera and a rain-sensing camera.
 31. The vehicle rearview mirror system of claim 17 wherein said drive circuit has components in common with said garage door opener and said tire pressure monitoring system.
 32. The vehicle rearview mirror system of claim 17 wherein said microcontroller is on a circuit board.
 33. The vehicle rearview mirror system of claim 32 wherein said drive circuit, said garage door opener and said tire pressure monitoring system are at least partially on said circuit board.
 34. A vehicular rearview mirror system suitable for use in a vehicle, comprising: at least one tire pressure sensor associated with a tire on a wheel of the vehicle, said at least one tire pressure sensor emitting a tire pressure-monitoring signal indicative of tire pressure; an interior rearview mirror system comprising an interior variable reflective element, said interior variable reflective element assuming a partial reflectance level in response to an interior drive signal; a microcontroller; a drive circuit, said drive circuit supplying an interior drive signal to said interior variable reflective element; a garage door opener, said garage door opener including a transmitter for transmitting a garage door opening signal; a tire pressure monitoring system, said tire pressure monitoring system including a receiver for receiving a signals emitted by said at least one tire pressure sensor; wherein said microcontroller controls at least in part said drive circuit, said garage door opener and said tire pressure monitoring system; wherein said microcontroller controls over a vehicle network at least one other vehicle function.
 35. The vehicular rearview mirror system of claim 34 wherein said at least one tire pressure sensor comprises a plurality of tire pressure sensors associated with different tires on different wheels of the vehicle, said tire pressure sensors emitting tire pressure-monitoring signals indicative of tire pressure of the respective one of said tires.
 36. The vehicular rearview mirror system of claim 34 wherein said interior variable reflective element comprises an electrochromic reflective element.
 37. The vehicular rearview mirror system of claim 34 further including a digital sound-processing system, wherein said microcontroller controls at least in part said digital sound-processing system.
 38. The vehicle rearview mirror system of claim 34 including a battery supplying power to said drive circuit, said garage door opener and said tire pressure monitoring system that is separate from the vehicle ignition.
 39. The vehicle rearview mirror system of claim 38 wherein said battery is rechargeable.
 40. The vehicle rearview mirror system of claim 39 including a solar system for charging said battery.
 41. The vehicle rearview mirror system of claim 34 wherein said at least one other vehicle function comprising control of a driver-side exterior mirror assembly, said driver-side exterior mirror assembly comprising a driver-side variable reflective element, said driver-side variable reflectance element assuming a partial reflectance level in response to a driver-side drive signal.
 42. The vehicle rearview mirror system of claim 41 wherein said partial reflectance level of said interior reflective element assumed in response to said interior mirror electrochromic reflective element drive signal differs from said partial reflectance level of said driver-side reflective element assumed in response to said driver-side exterior mirror electrochromic reflective element drive signal.
 43. The vehicle rearview mirror system of claim 41 wherein said at least one other vehicle function further comprising control of a passenger-side exterior mirror assembly, said passenger-side exterior mirror assembly comprising a passenger-side variable reflective element, said passenger-side variable reflectance element assuming a partial reflectance level in response to a passenger-side drive signal.
 44. The vehicle rearview mirror system of claim 43 wherein said partial reflectance level of said interior reflective element assumed in response to said interior mirror electrochromic reflective element drive signal differs from said partial reflectance level of said driver-side reflective element assumed in response to said driver-side exterior mirror electrochromic reflective element drive signal.
 45. The vehicle rearview mirror system of claim 43 wherein said partial reflectance level of said interior reflective element assumed in response to said interior mirror electrochromic reflective element drive signal differs from said partial reflectance level of said passenger-side reflective element assumed in response to said passenger-side exterior mirror electrochromic reflective element drive signal.
 46. The vehicle rearview mirror system of claim 34 wherein said at least one other vehicle function comprising control of a passenger-side exterior mirror assembly, said passenger-side exterior mirror assembly comprising a passenger-side variable reflective element, said passenger-side variable reflectance element assuming a partial reflectance level in response to a passenger-side drive signal.
 47. The vehicle rearview mirror system of claim 46 wherein said partial reflectance level of said interior reflective element assumed in response to said interior mirror electrochromic reflective element drive signal differs from said partial reflectance level of said passenger-side reflective element assumed in response to said passenger-side exterior mirror electrochromic reflective element drive signal.
 48. The vehicle rearview mirror system of claim 34 wherein said microcontroller receives an input from a phototransistor.
 49. The vehicle rearview mirror system of claim 34 wherein said microcontroller receives an input from a photodiode.
 50. The vehicle rearview mirror system of claim 34 wherein said microcontroller comprises a microprocessor.
 51. The vehicle rearview mirror system of claim 34 wherein said interior mirror system including a forward-facing camera, said forward-facing camera at least partially controlled by said microcontroller.
 52. The vehicle rearview mirror system of claim 51 wherein said forward-facing camera comprises at least one of a headlamp-controlling camera and a rain-sensing camera.
 53. The vehicle rearview mirror system of claim 34 wherein said drive circuit has components in common with said garage door opener and said tire pressure monitoring system.
 54. The vehicle rearview mirror system of claim 34 wherein said microcontroller is on a circuit board.
 55. The vehicle rearview mirror system of claim 34 wherein said drive circuit, said garage door opener and said tire pressure monitoring system are at least partially on said circuit board.
 56. The vehicular rearview mirror system of claim 34 wherein said vehicle network comprises at least one wired network connection.
 57. The vehicular rearview mirror system of claim 56 wherein said vehicle network comprises a protocol selected from the group consisting of a LIN, a CAN and a LAN.
 58. The vehicular rearview mirror system of claim 57 wherein said vehicle network comprises at least one of a wire, a cable and a fiber-optic connection.
 59. The vehicular rearview mirror system of claim 34 wherein said vehicle network comprises at least partially a wireless network.
 60. The vehicular rearview mirror system of claim 59 wherein said wireless network comprises a short-range wireless connection.
 61. The vehicular rearview mirror system of claim 60 wherein said wireless network comprises a BLUETOOTH protocol.
 62. The vehicular rearview mirror system of claim 59 wherein said wireless network comprises at least one of an infrared and a radio-frequency connection.
 63. The vehicle rearview mirror system of claim 34 wherein said at least one other vehicle function includes a function associated with at least one of an instrument panel and a headlight control circuit and wherein ambient light level information is provided to said at least one of an instrument panel and a headlight control circuit over said network.
 64. The vehicle rearview mirror system of claim 63 wherein said ambient light level information is developed by said drive circuit.
 65. The vehicle rearview mirror system of claim 34 wherein said at least one other vehicle function comprises a reverse gear detection function and wherein said digital electrochromic drive circuit responds to reverse gear information sent over said network to establish a high reflectance level of said interior mirror electrochromic reflective element.
 66. The vehicle rearview mirror system of claim 34 including a positioning system for positioning a reflective element and wherein said at least one other vehicle function includes a memory function and wherein said network supplies memory values to operate said positioning system.
 67. The vehicle rearview mirror system of claim 34 wherein said vehicle network comprises at least a wired connection comprising no more than three wires.
 68. The vehicle rearview mirror system of claim 34 wherein said at least one other vehicle function comprises a remote keyless entry function.
 69. The vehicle rearview mirror system of claim 34 wherein said at least one other vehicle function comprises a navigational system function.
 70. The vehicle rearview mirror system of claim 69 wherein said navigational system function comprises a global-positioning system function.
 71. The vehicle rearview mirror system of claim 34 wherein said at least one other vehicle function comprises a telematics function.
 72. The vehicle rearview mirror system of claim 71 wherein said interior mirror system includes at least one microphone.
 73. The vehicle rearview mirror system of claim 71 wherein said telematics function comprises a speech-recognition mode.
 74. The vehicle rearview mirror system of claim 73 wherein said interior mirror system includes a user control, actuation of which is transmitted over said network.
 75. The vehicle rearview mirror system of claim 74 wherein said user control comprises a user-operable button.
 76. The vehicle rearview mirror system of claim 34 wherein said at least one other vehicle function comprises a display function.
 77. The vehicle rearview mirror system of claim 76 wherein said display function comprises a vehicle heading information display function.
 78. The vehicle rearview mirror system of claim 77 wherein information from a magnetic sensor is supplied over said network.
 79. The vehicle rearview mirror system of claim 77 wherein said display function comprises a seatbelt warning status display function.
 80. The vehicle rearview mirror system of claim 34 wherein said interior mirror system receives at least one chosen from gear status information, engine information, alarm information and door opener information.
 81. The vehicle rearview mirror system of claim 34 wherein said interior mirror system receives information over said network.
 82. The vehicle rearview mirror system of claim 81 wherein said information comprises at least one chosen from gear status information, magnetic sensor information, engine information, alarm information and door opener information.
 83. The vehicle rearview mirror system of claim 81 wherein said information comprises door opener information.
 84. The vehicle rearview mirror system of claim 83 wherein said rearview mirror system activates general lighting of the vehicle when a door of the vehicle is opened. 